JP2000204243A - Polyamide resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a resin composition capable of giving a molded product, which is excellent in impact strength, heat resistance, as a road-antifreezing agent, in appearance and flexing resistance at a hinge portion of the molded product. SOLUTION: The polyamide resin composition comprises (A) an aromatic polyamide, (B) a modified polyolefin modified with an unsaturated carboxylic acid compound, and (C) an epoxidated diene block copolymer (C) wherein the component (A) in the composition ranges 55 to 85 wt.%, the total of the components (B) and (C) ranges 45 to 15 wt.%, and the content of the component (B) in the total of the components (B) and (C) ranges 20 to 80 wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aromatic polyamide resin composition, and more particularly to an aromatic polyamide resin composition, an unsaturated carboxylic acid compound and a polymer containing an epoxy group, wherein calcium chloride or the like is a main component. Good resistance to road surface deicing agents to be used, rigidity, impact resistance,
The present invention relates to a resin composition suitable for a molded article having an automobile underhood part, a connector, and a hinge part having excellent heat resistance and the like.

[0002]

2. Description of the Related Art Polyamide resins have excellent heat resistance, moldability, rigidity, toughness, etc., and are particularly useful for interior and exterior products of automobiles, such as radiator tank tops and bases, cylinder head covers, and canisters. ,gear,
Valves, connectors, through anchors, various tanks,
It is used for various automobile underhood parts such as brake pipes, fuel pipe tubes, and wheel cap exterior parts. Recently, these parts have been required to have higher functions. Materials having higher resistance to calcium chloride and magnesium chloride which are sprayed as a road surface deicing agent in winter are required, and reduction in weight of components, that is, reduction in specific gravity of components and reduction in thickness and thickness are actively studied.

[0003] However, polyamide resins are more likely to absorb water than other resins, and the absorption of water lowers the material rigidity and heat resistance, and the dimensions are liable to fluctuate, which hinders application to resin parts. Therefore, so-called high-grade (meaning that the number of carbon atoms is large) polyamide represented by nylon 11, nylon 12, nylon 6,10, and nylon 6.12 has low water absorption, good dimensional stability, good chemical resistance, and the like. Moreover, it has excellent resistance to road deicing agents such as calcium chloride and magnesium chloride, but its use is limited due to heat resistance, lack of rigidity, and high production cost. Further, since nylon 6 and nylon 66 have high heat resistance and high rigidity, an attempt is made to blend a lower polyamide such as nylon 6 or nylon 66 and a higher polyamide such as nylon 11 or nylon 12 to compensate for both disadvantages. (JP-A-57-212252, JP-A-57-124934, and JP-A-57-124934).
-80448, JP-A-57-80449, etc.). On the other hand, attempts have been made to reduce the water absorption by mixing a polyamide resin with a polymer other than the polyamide resin (JP-A-3-285951, JP-A-4-20256).
No. 0). As a polyamide resin composition that can withstand use in a high-temperature atmosphere, an aromatic polyamide resin or a reinforced product thereof has been proposed (JP-A-59-16).
1428, JP-A-59-155426, JP-A-59-5
3536, JP-A-62-156130). JP-A-61-283653 discloses that the impact resistance is improved by blending a modified polyolefin with the aromatic polyamide resin described above.

[0004]

The method of blending nylon 11 or nylon 12 with nylon 6 or nylon 66 or the method of mixing olefin certainly provides the effect of reducing water absorption, but lowers the heat resistance of the composition. Have done
Cannot be used in high temperature atmosphere.

[0005] Mixing an olefin with nylon 6 or nylon 66 can provide a reasonably low water absorption effect, but simply mixing a polyolefin resin has the disadvantage of deteriorating the heat resistance of the composition. .

The polyamide resin composition containing terephthalic acid and isophthalic acid certainly has low water absorption, but has a high water absorption compared to high-grade nylon and is resistant to road deicing agents such as calcium chloride and magnesium chloride at high temperatures. Inferior. Further, glass-reinforced products of polyamide resins containing these have low water absorption and excellent rigidity at the time of water absorption, but have high specific gravity and cannot reduce the weight of parts.

On the other hand, in view of the required performance of automobile underhood parts, high rigidity, high heat distortion temperature, and high resistance to road deicing agents such as calcium chloride and magnesium chloride, which can withstand use in a high temperature atmosphere by an engine, are obtained. It is necessary to have a polyamide resin composition that has high rigidity and toughness at the time of water absorption, is inexpensive, can easily form thin-walled molded products such as connectors and clips, has small dimensional changes in molded products after molding, and can reduce the weight. Become.

Therefore, it has been a problem to provide a resin composition having both such mechanical properties and chemical properties.

[0009]

Means for Solving the Problems In view of the above situation, the present inventors have conducted intensive studies on a resin composition in order to solve the above problems, and as a result, have found that an aromatic polyamide, a specific ethylene copolymer and an epoxidized diene The inventors have found that all problems can be solved by combining the system block copolymers in a specific ratio, and arrived at the present invention. That is, the present invention provides a polyamide (A) containing a structural unit formed from an aliphatic diamine having 4 to 18 carbon atoms and terephthalic acid, a modified polyolefin (B) modified with an unsaturated carboxylic acid compound, and epoxidation. A polyamide resin composition comprising a diene-based block copolymer (C), wherein the component (A) is 55 to 85% by weight based on the composition, and (B)
A polyamide resin composition wherein the sum of the component and the component (C) is 45 to 15% by weight, and the component (B) is 20 to 80% by weight based on the total of the components (B) and (C). ".

[0010]

Embodiments of the present invention will be described below. In the present invention, “weight” means “mass”. The aromatic polyamide (A) of the present invention is a polyamide formed from an aliphatic diamine having 4 to 18 carbon atoms and terephthalic acid.

[0011] Such a polyamide can be obtained as a raw material from a combination selected from alkylenediamine, aminocarboxylic acid or lactam, terephthalic acid, isophthalic acid and aliphatic alkylenedicarboxylic acid.

Specific examples of the aliphatic alkylenediamine include 1,4-diamino-1,1-dimethylbutane and 1,4-diamino.
Diamino-1-ethylbutane, 1,4-diamino-1,
2-dimethylbutane, 1,4-diamino-1,3-dimethylbutane, 1,4-diamino-1,4-dimethylbutane, 1,4-diamino-2,3-dimethylbutane, 1,
2-diamino-1-butylethane, 6-diaminohexane, 1,5-diamino-2-methylpentane, 1,7-
Diaminoheptane, 1,8-diaminooctane, 1,6
-Diamino-2,5-dimethylhexane, 1,6-diamino-2,4-dimethylhexane, 1,6-diamino-
3,3-dimethylhexane, 1,6-diamino-2,2
-Dimethylhexane, 1,9-diaminononane, 1,6
-Diamino-2,2,4-trimethylhexane, 1,6
-Diamino-2,4,4-trimethylhexane, 1,7
-Diamino-2,3-dimethylhexane, 1,7-diamino-2,4-dimethylheptane, 1,7-diamino-
2,5-dimethylheptane, 1,7-diamino-2,2
-Dimethylheptane, 1,10-diaminodecane, 1,
8-diamino-1,3-dimethyloctane 1,8-diamino-1,4-diaminooctane, 1,8-diamino-
2,4-dimethyloctane, 1,8-diamino-3,4
-Dimethyloctane, 1,8-diamino-4,5-dimethyloctane, 1,8-diamino-2,2-dimethyloctane, 1,8-diamino-3,3-dimethyloctane, 1,8-diamino-4 , 4-dimethyloctane,
1,6-diamino-2,4-diethylhexane, 1,9
-Diamino-5-methylnonane, 1,11-diaminoundecane, 1,12-diaminododecane, and the like. Among these alkylenediamine components, 1,6-diaminohexane, 1,8-diaminooctane, 1,10-diaminodecane, 1,12-diaminododecane or a mixture thereof is preferable.

Specific examples of the aliphatic alkylenedicarboxylic acid component unit include succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, decandioic acid, undecandioic acid and dodecandioic acid. Is preferred.

As the lactam, ε-caprolactam, ξ-enantholactam, η-caprylactam, ω
-Laurolatam or the like can be used.

The method for producing the polyamide of the present invention is not particularly limited, but the raw material or an aqueous solution of a salt of a diamine and a dicarboxylic acid is stirred with a water vapor pressure of 20 kg / cm 2 or less, 15 kg or less.
0 to 320 ° C. to produce a low-order condensate having ηr = 1.1 to 1.6, which is further subjected to solid-state polymerization at a temperature not higher than the melting point, or a single-screw screw with a vent port or a twin-screw A method of increasing the degree of polymerization using a screw extruder is simple and suitable. According to the present invention, the presence of a phosphorus-based catalyst is effective in obtaining a good high polymerization degree pellet in the melt extrusion step, and the amount of addition is 0.02 to the low-order condensate.
2% by weight is preferable, and more preferably 0.05 to 1.2%.
% By weight. Specific examples of the phosphorus compound include H3 PO
4, H3 PO3, H3 PO2, H4 P2 O7, NaH2
PO4.2H2O, Na2HPO4.12H2O, Na
3 PO4 .12H2 ONa H2 PO4 .H2 O, Na 4
P2 O7 .10H2 O, Na2 H2 P2 O7 .6H2
O, Na5P3O10, C6H5P (OH) 2, C6H5
PO (ONa) 2, C6 H5PO (OH) 2, Mn (H2
PO2) 2 and (C6 H5 O) 3 P. Preferably, they are H3 PO4 and H4 P2 O7.
There is no particular limitation on the method of adding the phosphorus compound, and a method of preparing a low-order condensate, or a method of preliminarily blending with the low-order condensate and melt-extruding it, is suitable.

Examples of the unsaturated carboxylic acid compound which gives the modified polyolefin (B) modified with the unsaturated carboxylic acid compound include acrylic acid, methacrylic acid, maleic acid and anhydrides and ester compounds thereof. You. Among them, maleic acid or a maleic acid derivative is preferred, and maleic acid, methyl maleic acid, a maleic acid metal salt, methyl hydrogen maleate, dimethyl maleate, and maleic anhydride are exemplified, and maleic anhydride is more preferably used.

Examples of the olefin to give the modified polyolefin (B) include ethylene, propylene, butene-1, pentene-1, hexene-1,4-methylpentene-1 and the like, and these can be used alone or in combination.

Examples of the chemical structure of the modified polyolefin (B) include a copolymer of an olefin and an unsaturated carboxylic acid compound, and a graft of an unsaturated carboxylic compound to a polyolefin. The former copolymer may have a random or block structure.

The method for producing the modified polyolefin (B) is not particularly limited, and various known methods can be employed. For example, a method of melt-kneading an unmodified polyolefin with a radical initiator and graft-introducing it, a method of dissolving the unmodified polyolefin in a solvent and adding a radical initiator to graft-introduce it, or a method of grafting the unmodified polyolefin with the main component unmodified polyolefins They can be mixed and copolymerized.

Among the above-mentioned polyolefins, preferred are polypropylene, polyethylene, and random or block copolymers obtained by copolymerizing propylene or other α-olefins with ethylene. The amount of the unsaturated carboxylic acid compound to be introduced is from 0.3 to 5 parts by weight, preferably from 0.5 to 3 parts by weight, based on 100 parts by weight of the resulting modified polyolefin.
Suitably, it is in the range of parts by weight. 0.3
If the amount is less than parts by weight, sufficient impact resistance cannot be obtained. On the other hand, when the introduction amount exceeds 5 parts by weight, the product is markedly colored during molding, which is not preferable.

The diene block copolymer (C) component used in the present invention is a block copolymer comprising a polymer block mainly composed of a vinyl aromatic compound and a polymer block mainly composed of a conjugated diene compound. Polymer
The weight ratio of the vinyl aromatic compound to the conjugated diene compound (the weight ratio of the block copolymer) is from 5/95 to 70/30, particularly preferably from 10/90 to 60/40.
The number average molecular weight of the block copolymer used in the present invention is 5,000 to 600,000, preferably 10,000.
0 to 500,000, and the molecular weight distribution [the ratio of the weight average molecular weight (Mw) to the number average molecular weight (Mn) (Mw)
/ Mn)] is 10 or less. The molecular structure of the block polymer may be linear, branched, radial, or any combination thereof. For example, X-
Y-X, Y-X-Y-X, (X-Y-) 4Si, XY
It is a vinyl aromatic compound (X) block-conjugated diene compound (Y) block copolymer having a structure such as -XYX. Further, the unsaturated bond of the conjugated diene compound of the diene-based block copolymer may be partially hydrogenated.

Examples of the vinyl aromatic compound constituting the diene block polymer include styrene, α-methylstyrene, vinyltoluene, p-tertiary butylstyrene,
One or more of divinylbenzene, p-methylstyrene, 1,1-diphenylstyrene and the like can be selected, and styrene is particularly preferred. As the conjugated diene compound, for example, butadiene, isoprene, 1,
One of 3-pentadiene, 2,3-dimethyl-1,3-butadiene, piperylene, 3-butyl-1,3-octadiene, phenyl-1,3-butadiene,
Alternatively, two or more types are selected, and among them, butadiene, isoprene and a combination thereof are preferable.

As a method for producing the block polymer used in the present invention, any production method having the above-mentioned structure can be adopted. For example, Japanese Patent Publication No. 40-2
3798, JP-B-47-3252, JP-B-48-2
No. 423, Japanese Patent Application No. 49-105970, Japanese Patent Application No. 50-
No. 27094, JP-B-46-32415, JP-A-59-1984
No. 166518, JP-B-49-36957, JP-B-43-17979, JP-B-46-32415, JP-B-56-28925 and the like, using a lithium catalyst or the like. A vinyl aromatic compound-conjugated diene compound block copolymer can be synthesized in a solvent. Further, Japanese Patent Publication No. 42-8704, Japanese Patent Publication No. 43-6636, or
According to the method described in JP-A-133203, the partially hydrogenated block copolymer to be used in the present invention can be synthesized by hydrogenation in an inert solvent in the presence of a hydrogenation catalyst.

The epoxidized diene-based block copolymer used in the present invention is obtained by epoxidizing the above-mentioned diene-based block copolymer.

The epoxidized diene-based block copolymer in the present invention can be obtained by reacting the above-mentioned block copolymer with an epoxidizing agent such as a hydroperoxide or a peracid in an inert solvent. Examples of peracids include formic acid, peracetic acid, and perbenzoic acid. In the case of hydroperoxides, a catalytic effect can be obtained by using a mixture of tungstic acid and caustic soda with hydrogen peroxide, an organic acid with hydrogen peroxide, or molybdenum hexacarbonyl with tertiary butyl hydroperoxide. .

There is no strict limit on the amount of epoxidizing agent,
The optimal amount in each case will depend on variables such as the particular epoxidizing agent used, the degree of epoxidation desired, the particular block copolymer used, and the like.

The obtained epoxidized diene-based copolymer can be isolated by a suitable method, for example, a method of precipitating with a poor solvent, a method of putting the polymer into hot water with stirring and distilling off the solvent, or a method of directly removing the solvent. It can be performed by a desolvation method or the like.

The epoxy equivalent of the obtained epoxidized (hydrogenated) diene block copolymer is preferably from 320 to 8
000.

In the thermoplastic resin composition of the present invention, the polyamide (A) needs to be 55 to 85% by weight, more preferably 60 to 85% by weight, furthermore 65 to 8% by weight.
A range of 0% by weight is preferred. Accordingly, the sum of the components (B) and (C) must be 45 to 15% by weight, more preferably 40 to 15% by weight, furthermore 35 to 20% by weight.
A range of weight% is preferred. When the amount of the polyamide (A) is small, there is a tendency that heat resistance, rigidity is insufficient, molding fluidity is deteriorated due to an increase in melt viscosity, and a flow mark is generated when a molded article having a thin portion is molded. And anti-freezing agent properties tend to be insufficient.

The component (B) must be present in an amount of 20 to 80% by weight based on the sum of the components (B) and (C). If it deviates, the weld of the molded product will stand out,
In particular, it becomes difficult to manufacture a thin molded product.

The method of mixing the components (A), (B) and (C) is not particularly limited, and a usual method can be employed. For example, a method of uniformly mixing these components with a high-speed stirrer, followed by melt-kneading with an extruder having sufficient kneading ability, a method of dry-blending these components, and a method of injection molding or extrusion molding. Can also be adopted.

The resin composition of the present invention is generally molded by a known thermoplastic resin molding method such as injection molding, extrusion molding, blow molding, transfer molding, and vacuum molding.
Further, as long as the resin composition of the present invention does not impair its moldability and physical properties, other components in any process, such as pigments, dyes, heat-resistant agents, antioxidants, weathering materials, lubricants,
A crystal nucleating agent or the like can be added and introduced.

The resin composition of the present invention is suitable for use in automobile underhood parts, connectors,
Most suitable for molded products having the following hinge parts.

[0034]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the present invention is limited thereto without departing from the gist thereof.

Table 1 shows the aromatic polyamides and modified polyolefins used in the examples. The aromatic polyamide has a hexamethylene adipamide structural unit (66 units) and a hexamethylene terephthalamide structural unit (6T units) in the proportions shown in Table 1. The modified polyolefin is a polymer selected from polypropylene (PP), polyethylene (PE) and ethylene propylene copolymer (EPM), maleic anhydride (MLA), and a peroxide, Nippon Oil & Fat, in the proportions shown in Table 1. A mixture of Perhexa 25B-40 (2,5-dimethyl-2,5-di (t-butylperoxy) hexane) was heated at 310 ° C.
Was supplied to an extruder having a twin screw of 30 mmφ and melt-kneaded to obtain pellets of polyolefin modified with maleic anhydride.

[0036]

[Table 1] Further, the epoxidized diene-based block copolymer was prepared by the following method to obtain C-1 to C-3 copolymers.

C-1 Polystyrene-polybutadiene-polystyrene block copolymer [styrene / butadiene weight ratio =
40/60] and 300 g of ethyl acetate were charged and dissolved. Then, a 30 wt% solution of peracetic acid in ethyl acetate 1
65 g were continuously dropped, and an epoxidation reaction was performed at 40 ° C. for 3 hours with stirring. The reaction solution was returned to room temperature, taken out of the reactor, and a large amount of methanol was added to precipitate a polymer. The polymer was separated by filtration, washed with water, and dried to obtain an epoxy-modified polymer. The obtained epoxidized diene block copolymer is represented by C
-1 (epoxy equivalent of copolymer: 490).

C-2 A block copolymer of polystyrene-polybutadiene-polystyrene [weight ratio of styrene / butadiene = styrene] was added to a jacketed reactor equipped with a stirrer, a reflux condenser, and a thermometer.
20/80] 300 g and cyclohexane 3000 g were charged and dissolved at a temperature of 60 ° C., and 40 ml of a di-P-tolylbis (1-cyclopentadienyl) titanium / cyclohexane solution (concentration 1 mmol / l) as a hydrogenation catalyst, and n 8 mL of a butyllithium solution (concentration: 5 mmol / L) at 0 ° C., 2.0 kg / C
The mixture was added under a hydrogen pressure of m2, and a hydrogen partial pressure of 2.5 was added.
The reaction was performed at kg / cm2 for 60 minutes. The solvent was removed from the obtained partially hydrogenated polymer solution by drying under reduced pressure (the hydrogenation ratio of the entire butadiene portion was 80%). This partially hydrogenated polymer 3
00g and cyclohexane 1500g were charged and dissolved.
Then, 200 g of a 30% by weight solution of peracetic acid in ethyl acetate was continuously dropped, and an epoxidation reaction was carried out at 40 ° C. for 3 hours with stirring. The reaction solution was returned to room temperature, taken out of the reactor, and a large amount of methanol was added to precipitate a polymer. The polymer was separated by filtration, washed with water, and dried to obtain an epoxy-modified polymer. The obtained epoxidized diene-based block copolymer is designated as C-2 (epoxy equivalent of the copolymer is 460).

C-3 A block copolymer of polystyrene / polyisoprene / polystyrene [styrene / isoprene weight ratio =
30/70] and 2,500 g of cyclohexane were charged and dissolved, a nickel catalyst was added as a hydrogenation catalyst, and the mixture was reacted at a hydrogen partial pressure of 15 kg / cm 2 and a temperature of 150 ° C. for 3 hours. The solvent was removed from the obtained partially hydrogenated polymer solution by drying under reduced pressure (the hydrogenation rate of the entire butadiene portion was 85%).
%). 300 g of this partially hydrogenated polymer, 1 part of cyclohexane
500 g was charged and dissolved. Then 30% by weight of peracetic acid
150 g of ethyl acetate solution was continuously dropped, and the mixture was stirred at 40 ° C.
For 3 hours. The reaction solution was returned to room temperature, taken out of the reactor, and a large amount of methanol was added to precipitate a polymer. The polymer was separated by filtration, washed with water, and dried to obtain an epoxy-modified polymer. The obtained epoxidized diene-based block copolymer is designated as C-3 (epoxy equivalent of the copolymer is 7).
50).

The physical properties of the molded articles and the corresponding test pieces described in Examples and Comparative Examples were measured and evaluated by the following methods.

1. Flexural modulus: ASTM D
790 2. 2. Heat distortion temperature (HDT): ASTM D648 (load 4.6 kgf / cm 2) 3. Izod impact strength: ASTM D256 Molded product appearance: A pin gate type connector was molded, and the surface roughness of the molded product and the occurrence of flow marks were visually observed. ：: The surface is smooth, there is no flow mark and no weld is observed. X: Flow mark is generated or the presence of weld is observed. 5. Hinge bending resistance: A process in which a molded product having a connecting hinge having a width of 30 mm, a length of 3 mm, and a thickness of 0.5 mm is formed, and the body is bent 180 ° so that the surfaces of the main body portion overlap with the hinge portion of the molded product as a fulcrum. As the cycle, the number of cycles until the hinge portion was broken was measured.

6. Chemical resistance (anti-freezing agent) resistance: A molded product of a pin gate type connector is immersed in water at 90 ° C. for 24 hours, and then left in a gear oven at 100 ° C. for 1 hour.
A 50% aqueous solution of calcium chloride is sprayed in the form of water drops once every hour. With the treatment as one cycle, the number of cycles until cracks occurred in the molded article was measured.

Examples 1 to 6 Materials having the compounding ratios shown in Table 2 were uniformly dispersed by a stirrer and supplied to an extruder having a 45 mmφ twin screw to be melt-kneaded into pellets. . After vacuum drying the obtained pellets at 80 ° C. (18 hours), the cylinder temperature was 310 ° C. and the mold temperature was 10 ° C. by an injection molding machine.
A molded article having an ASTM test piece and a connecting hinge was formed at 0 ° C. Table 2 shows the test results.

The appearance of the molded product was good without any flow mark, and the weld was inconspicuous. The anti-road anti-freezing agent had no cracks on the surface of the molded article even after more than 50 cycles, and had an extremely excellent anti-road anti-freezing property.

The hinge bending resistance did not break until 10 cycles, confirming that it was suitable for parts having a hinge structure.

[0046]

[Table 2] Comparative Examples 1 and 2 Pellets were obtained in the same manner as in the examples by mixing them in the mixing ratios shown in Table 3, and the same tests as in the examples were performed. However, it was found that the heat resistance and rigidity were poor. Flow marks appeared on the appearance of the molded product, and the weld was conspicuous. Also, the hinge bending resistance test was not good.

Comparative Example 3 Pellets were obtained in the same manner as in the examples by mixing them in the mixing ratios shown in Table 3, and the same tests as in the examples were performed. It was found that heat resistance and rigidity were poor. The appearance of the molded product was such that flow marks were generated, welds were conspicuous, and the hinge bending resistance test was not good.

Comparative Example 4 Pellets were obtained in the same manner as in the examples by mixing them in the mixing ratios shown in Table 3, and the same tests as in the examples were performed, but it was found that the impact resistance was poor.

Comparative Examples 5 to 8 Pellets were obtained in the same manner as in the examples by mixing them in the mixing ratios shown in Table 3, and the same tests as in the examples were performed. The weld was conspicuous, and the hinge bending resistance test revealed that it was not practical.

[0050]

[Table 3]

[0051]

[Effect of the Invention] In particular, by combining a modified polyolefin composed of an unsaturated carboxylic acid compound and a polyolefin having an epoxy group into an aromatic polyamide, impact strength, heat resistance, anti-freezing agent for roads and appearance of molded articles are obtained. As a result, a resin composition which gives a molded article having excellent hinge part bending resistance can be obtained.

Claims (10)

[Claims] 1. A polyamide resin composition comprising an aromatic polyamide (A), a modified polyolefin (B) modified with an unsaturated carboxylic acid compound, and an epoxidized diene block copolymer (C). (A) component in the product is 55 to 85% by weight, the sum of the component (B) and the component (C) is 45 to 15% by weight, and the sum of the components (B) and (C) is ( B) A polyamide resin composition containing 20 to 80% by weight of a component. 2. An epoxidized diene block copolymer (C) comprising a polymer block mainly composed of vinyl aromatic in the same molecule and a polymer block mainly composed of a conjugated diene compound partially containing epoxy. The polyamide resin composition according to claim 1, comprising a polymer block mainly composed of a hydrogenated conjugated diene compound partially containing epoxy. 3. The polyamide resin composition according to claim 1, wherein the epoxy equivalent of the epoxidized diene-based block copolymer is in the range of 320 to 8,000. 4. The composition according to claim 1, wherein the content of the component (A) is 60 to 85% by weight, and the sum of the components (B) and (C) is 40 to 15%.
The polyamide resin composition according to any one of claims 1 to 4, wherein the content is% by weight. 5. The polyamide resin composition according to claim 1, wherein the unsaturated carboxylic compound for modifying the modified polyolefin (B) is a maleic acid derivative. 6. The polyamide resin composition according to claim 1, wherein the unsaturated carboxylic compound for modifying the modified polyolefin (B) is maleic anhydride. 7. The polyamide resin composition according to claim 1, wherein the modified polyolefin (B) is a copolymer of an olefin and an unsaturated carboxylic acid. 8. The polyamide resin composition according to claim 1, which is used for automobile underhood parts. 9. The polyamide resin composition according to claim 1, which is used for a connector. 10. The polyamide resin composition according to claim 1, which is used for a molded article having a hinge portion having a thickness of 0.5 mm or less.